Dinosaur pen



FIG. 1 is a right side view, in an exploded condition, of a dinosaur pen, showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a rear view thereof. 

The ornamental design for a dinosaur pen, as shown and described. 